The pwm-crc code is using 2 different enable bits: 1. bit 7 of the PWM0_CLK_DIV (PWM_OUTPUT_ENABLE) 2. bit 0 of the BACKLIGHT_EN register
So far we've kept the PWM_OUTPUT_ENABLE bit set when disabling the PWM, this commit makes crc_pwm_disable() clear it on disable and makes crc_pwm_enable() set it again on re-enable.
Acked-by: Uwe Kleine-König u.kleine-koenig@pengutronix.de Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Acked-by: Thierry Reding thierry.reding@gmail.com Signed-off-by: Hans de Goede hdegoede@redhat.com --- Changes in v3: - Remove paragraph about tri-stating the output from the commit message, we don't have a datasheet so this was just an unfounded guess --- drivers/pwm/pwm-crc.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c index 81232da0c767..b72008c9b072 100644 --- a/drivers/pwm/pwm-crc.c +++ b/drivers/pwm/pwm-crc.c @@ -54,7 +54,9 @@ static int crc_pwm_calc_clk_div(int period_ns) static int crc_pwm_enable(struct pwm_chip *c, struct pwm_device *pwm) { struct crystalcove_pwm *crc_pwm = to_crc_pwm(c); + int div = crc_pwm_calc_clk_div(pwm_get_period(pwm));
+ regmap_write(crc_pwm->regmap, PWM0_CLK_DIV, div | PWM_OUTPUT_ENABLE); regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 1);
return 0; @@ -63,8 +65,10 @@ static int crc_pwm_enable(struct pwm_chip *c, struct pwm_device *pwm) static void crc_pwm_disable(struct pwm_chip *c, struct pwm_device *pwm) { struct crystalcove_pwm *crc_pwm = to_crc_pwm(c); + int div = crc_pwm_calc_clk_div(pwm_get_period(pwm));
regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 0); + regmap_write(crc_pwm->regmap, PWM0_CLK_DIV, div); }
static int crc_pwm_config(struct pwm_chip *c, struct pwm_device *pwm,